<template>
    <div>
         <!-- 面包屑导航区 -->
         <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="rolesList" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbuttom',i1 === 0 ? 'bdtop':'','vcenter']" v-for="(item1,i1) in 
                        scope.row.children" :key="i1">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable
                                @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in 
                                item1.children" :key="i2">
                                    <el-col :span="6">
                                        <el-tag type="success" closable
                                        @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3,i3) in 
                                        item2.children" :key="i3" closable
                                        @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="#"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <!-- 编辑 -->
                        <el-button size="mini" type="primary" icon="el-icon-edit"
                        @click="showEditDialog(scope.row.id)">编辑</el-button>
                        <!-- 删除 -->
                        <el-button size="mini" type="danger" icon="el-icon-delete"
                        @click="removeRolesById(scope.row.id)">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting"
                        @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>

            <!-- 添加用户的对话框 -->
            <el-dialog
            title="添加用户"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed">
            <!-- 内容主体区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="addForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                <el-input v-model="addForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <!-- 底部区域 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addRoles">确 定</el-button>
            </span>
            </el-dialog>

                <!-- 修改用户的对话框 -->
            <el-dialog
                title="修改用户"
                :visible.sync="editDialogVisible"
                width="50%"
                @close="editDialogClosed">
                <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="70px">
                    <el-form-item label="角色名称">
                    <el-input v-model="editForm.roleName" disabled></el-input>
                    </el-form-item>
                    <el-form-item label="角色描述">
                    <el-input v-model="editForm.roleDesc"></el-input>
                    </el-form-item>
                </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="editDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="editRolesInfo">确 定</el-button>
                </span>
            </el-dialog>
            
            <!-- 分配权限的对话框 -->
            <el-dialog
                title="分配权限"
                :visible.sync="setRightDialogVisible"
                width="50%"
                @close="setRightDialogClosed">
                <!-- 树形控件 -->
                <el-tree show-checkbox :data="rightsList" :props="treeProps"
                node-key="id" default-expand-all
                :default-checked-keys="defKeys" ref="treeref"></el-tree>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="setRightDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="allotRights">确 定</el-button>
                </span>
            </el-dialog>

        </el-card>

    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表
            rolesList:[],
            // 控制添加用户对话框的显示与隐藏
            addDialogVisible: false,
            // 添加用户的表单数据
            addForm: {
                roleName:'',
                roleDesc:''
            },
            // 添加用户的验证规则对象
            addFormRules: {
                roleName: [
                    { required: true ,message: '请输入角色名' ,trigger: 'blur'},
                    { min: 2, max: 10, message:'角色名的长度在2-10个字符之间' ,trigger: 'blur'}
                ],
                roleDesc: [
                    { required: true ,message: '请输入角色描述' ,trigger: 'blur'},
                    { min: 2, max: 15, message:'角色描述的长度在2-15个字符之间' ,trigger: 'blur'}
                ],
            },
            // 控制修改用户的对话框的显示与隐藏
            editDialogVisible: false,
            // 查询用户信息
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                roleName: [
                    { required: true ,message: '请输入角色名' ,trigger: 'blur'},
                    { min: 2, max: 10, message:'角色名的长度在3-10个字符之间' ,trigger: 'blur'}
                ],
                roleDesc: [
                    { required: true ,message: '请输入角色描述' ,trigger: 'blur'},
                    { min: 2, max: 15, message:'角色描述的长度在6-15个字符之间' ,trigger: 'blur'}
                ]
            },
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightsList: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label:'authName',
                children:'children'
            },
            // 默认选中的节点的数组
            defKeys: [],
            // 当前即将分配权限的角色id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        async getRolesList() {
            const {data:res} = await this.$http.get('roles')
            if(res.meta.status !== 200) return this.$message.error('获取列表失败')
            this.rolesList = res.data
            // console.log(this.rolesList)
        },
        // 监听添加用户对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮实现表单预验证
        addRoles(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return 
                // 可以发起添加用户的网络请求
                const {data:res} = await this.$http.post('roles',this.addForm)
                if(res.meta.status !== 201) return this.$message.error('添加用户失败')
                this.$message.success('添加用户成功')
                // 隐藏添加用户列表
                this.addDialogVisible = false
                // 重新获取列表
                this.getRolesList()
            })
        },
        // 展示编辑用户的对话框
        async showEditDialog(id) {
            this.editDialogVisible = true
            const {data:res} = await this.$http.get('roles/'+ id)
            if(res.meta.status !== 200) return this.$message.error('查询用户失败!')
            this.editForm = res.data
            // console.log(res.data);
            this.editDialogVisible = true
        },
        // 监听修改用户对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 修改用户信息并提交
        editRolesInfo() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                // 发起修改用户信息请求
                const {data:res} = await this.$http.put('roles/' + this.editForm.roleId,{
                    roleName:this.editForm.roleName,
                    roleDesc:this.editForm.roleDesc
                })
                if(res.meta.status !== 200) return this.$message.error('更新用户信息失败')               
                // 关闭对话框
                this.editDialogVisible = false
                // 刷新用户列表
                this.getRolesList()
                // 提示用户更新成功
                this.$message.success('更新用户信息成功')
            })
        },
        // 根据Id删除对应的用户信息
        async removeRolesById(id) {
            // 弹框询问是否删除
            const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            // 如果用户确认删除则返回confirm字符串
            // 如果用户取消了删除则返回值是cancel字符串
            // console.log(confirmResult);
            if(confirmResult !== 'confirm') return this.$message.info('已经取消删除')
            const {data:res} = await this.$http.delete('roles/' + id)
            if(res.meta.status !== 200) return this.$message.error('删除失败')
            this.$message.success('删除成功')
            this.getRolesList()
        },
        // 根据Id删除对应的权限
        async removeRightById(role,rightId) {
            // 弹框提示用户是否要删除
           const confirmResult =  await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if(confirmResult !== 'confirm') return this.$message.info('取消了删除！')
            
            const {data:res} =  await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status !== 200) return this.$message.error('删除权限失败')

            // 不用 this.getRolesList() 来更新列表是因为，如果重新获取整个列表的话会导致
            // 整个页面的刷新导致用户体验不佳
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            // 获取需要展示权限的角色id，将id分配给roleId供为角色分配权限使用
            this.roleId = role.id
            // 获取所有权限的数据
            const {data:res} = await this.$http.get('rights/tree')
            
            if(res.meta.status !== 200) return this.$message.error('获取权限数据失败')
            // 获取到的权限数据保存到data中
            this.rightsList = res.data
            // 递归获取三级节点的Id
            this.getLeafKeys(role,this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归的形式获取角色下所有三级权限id，并保存到defKeys数组中
        getLeafKeys(node,arr) {
            // 如果当前node节点不包含children属性则是三级节点
            if(!node.children) {
                return arr.push(node.id)
            }

            node.children.forEach(item =>this.getLeafKeys(item,arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeref.getCheckedKeys(),
                ...this.$refs.treeref.getHalfCheckedKeys()
            ]
            const idStr = keys.join(',')
            const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})

            if(res.meta.status !== 200) return this.$message.error('分配权限失败！')
            this.$message.success('分配权限成功')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbuttom {
    border-bottom: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>